| fortnight | 1 fn | 2 fn | 3 fn | 4 fn | 5 fn | 6 fn | 7 fn | 8 fn | 9 fn | 10 fn | 11 fn | 12 fn | 13 fn | 14 fn | 15 fn | 16 fn | 17 fn | 18 fn | 19 fn | 20 fn | 21 fn | 22 fn | 23 fn | 24 fn | 25 fn | 26 fn | 27 fn | 28 fn | 29 fn | 30 fn | 31 fn | 32 fn | 33 fn | 34 fn | 35 fn | 36 fn | 37 fn | 38 fn | 39 fn | 40 fn | 41 fn | 42 fn | 43 fn | 44 fn | 45 fn | 46 fn | 47 fn | 48 fn | 49 fn | 50 fn | 51 fn | 52 fn | 53 fn | 54 fn | 55 fn | 56 fn | 57 fn | 58 fn | 59 fn | 60 fn | 61 fn | 62 fn | 63 fn | 64 fn | 65 fn | 66 fn | 67 fn | 68 fn | 69 fn | 70 fn | 71 fn | 72 fn | 73 fn | 74 fn | 75 fn | 76 fn | 77 fn | 78 fn | 79 fn | 80 fn | 81 fn | 82 fn | 83 fn | 84 fn | 85 fn | 86 fn | 87 fn | 88 fn | 89 fn | 90 fn | 91 fn | 92 fn | 93 fn | 94 fn | 95 fn | 96 fn | 97 fn | 98 fn | 99 fn | 100 fn |
| decade | 0.0038331 dec | 0.0076661 dec | 0.0114992 dec | 0.0153323 dec | 0.0191654 dec | 0.0229984 dec | 0.0268315 dec | 0.0306646 dec | 0.0344977 dec | 0.0383307 dec | 0.0421638 dec | 0.0459969 dec | 0.0498299 dec | 0.0536630 dec | 0.0574961 dec | 0.0613292 dec | 0.0651622 dec | 0.0689953 dec | 0.0728284 dec | 0.0766615 dec | 0.0804945 dec | 0.0843276 dec | 0.0881607 dec | 0.0919938 dec | 0.0958268 dec | 0.0996599 dec | 0.1034930 dec | 0.1073260 dec | 0.1111591 dec | 0.1149922 dec | 0.1188253 dec | 0.1226583 dec | 0.1264914 dec | 0.1303245 dec | 0.1341576 dec | 0.1379906 dec | 0.1418237 dec | 0.1456568 dec | 0.1494898 dec | 0.1533229 dec | 0.1571560 dec | 0.1609891 dec | 0.1648221 dec | 0.1686552 dec | 0.1724883 dec | 0.1763214 dec | 0.1801544 dec | 0.1839875 dec | 0.1878206 dec | 0.1916536 dec | 0.1954867 dec | 0.1993198 dec | 0.2031529 dec | 0.2069859 dec | 0.2108190 dec | 0.2146521 dec | 0.2184852 dec | 0.2223182 dec | 0.2261513 dec | 0.2299844 dec | 0.2338175 dec | 0.2376505 dec | 0.2414836 dec | 0.2453167 dec | 0.2491497 dec | 0.2529828 dec | 0.2568159 dec | 0.2606490 dec | 0.2644820 dec | 0.2683151 dec | 0.2721482 dec | 0.2759813 dec | 0.2798143 dec | 0.2836474 dec | 0.2874805 dec | 0.2913135 dec | 0.2951466 dec | 0.2989797 dec | 0.3028128 dec | 0.3066458 dec | 0.3104789 dec | 0.3143120 dec | 0.3181451 dec | 0.3219781 dec | 0.3258112 dec | 0.3296443 dec | 0.3334773 dec | 0.3373104 dec | 0.3411435 dec | 0.3449766 dec | 0.3488096 dec | 0.3526427 dec | 0.3564758 dec | 0.3603089 dec | 0.3641419 dec | 0.3679750 dec | 0.3718081 dec | 0.3756412 dec | 0.3794742 dec | 0.3833073 dec |
A fortnight is a unit of time equal to 14 days (2 weeks). The word derives from the Old English: fēowertyne niht, meaning "fourteen nights".
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| fortnight | fn | ≡ 2 wk | = 1.2096 Ms | Metric system SI |
| fortnights | decades | fortnights | decades |
|---|---|---|---|
| 1 | = 0.0038330729678803 | 6 | = 0.022998437807282 |
| 2 | = 0.0076661459357607 | 7 | = 0.026831510775162 |
| 3 | = 0.011499218903641 | 8 | = 0.030664583743043 |
| 4 | = 0.015332291871521 | 9 | = 0.034497656710923 |
| 5 | = 0.019165364839402 | 10 | = 0.038330729678803 |
A decade is a period of ten years. The word is derived (via French and Latin) from the Ancient Greek: δεκάς (/ðɛkˈɑːs/, transliteration=dekas), which means a group of ten.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| decade | dec | ≡ 10 years (10 y) | = 315 569 260 s | Metric system SI |
| decades | fortnights | decades | fortnights |
|---|---|---|---|
| 1 | = 260.88728505291 | 6 | = 1565.3237103175 |
| 2 | = 521.77457010582 | 7 | = 1826.2109953704 |
| 3 | = 782.66185515873 | 8 | = 2087.0982804233 |
| 4 | = 1043.5491402116 | 9 | = 2347.9855654762 |
| 5 | = 1304.4364252646 | 10 | = 2608.8728505291 |
| fortnights | decades |
|---|---|
| 1 | = 0.0038331 |
| 260.8872851 | = 1 |
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |